Direct determination of the sign of the NO dipole moment.

A. Gijsbertsen, W.K. Siu, M.F. Kling, P. Johnsson, P. Jansen, S. Stolte, M.J.J. Vrakking

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Abstract

We report a novel approach for determining the sign of permanent dipole moments, using nitric oxide [NO(v=0)] as an example. State-selected NO (j=|m|=|Ω=1/2) molecules are focused using a hexapole and oriented in a strong dc electric field. The angular distributions of ionic fragments resulting from extreme ultraviolet single-photon and multiphoton dissociative ionization at 400 and 800 nm are measured and indicate that the dipole moment is negative (corresponding to N-O+). The experiments thus rule out an error in the sign of the dipole of NO as the possible source of a remarkable discrepancy between previous theoretical and experimental work on orientation effects in bimolecular collisions involving oriented NO. © 2007 The American Physical Society.
Original languageEnglish
Pages (from-to)213003
JournalPhysical Review Letters
Volume99
DOIs
Publication statusPublished - 2007

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